Hello,
I'm not sure if this is your GGM ...
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=52398357
Also, on the 1930 US Census (St. Johns City, Clinton, Michigan) there is a Swagart family (N.B. birth years are estimated):
Frank E. b.1869
Emma b.1873
Frank A. b.1910
Donna A. b.1917
Regards,
Kevin